"There are discrepancies in the documents of donors and recipients, including names and addresses. In one or two cases, the donor-recipient relationship on record doesn't look genuine. We have referred the cases to the state-appointed panel inquiring into the scam to find out if the hospital's authorities and its transplant authorisation panel followed rules and procedure," said a police officer. "This may be the tip of the iceberg. That is why we have asked the hospital to furnish at least a year's transplant records."

A source said the seven cases may include the three cases the hospital submitted to the police of its own accord for review, following the July 14 incident involving donor Shobha Thakur and recipient Brijkishore Jaiswal that led to the racket being unearthed. The hospital's board of trustees last week appointed Ernst & Young to audit all 31 transplants performed in the last one year.

Dr B K Kadam, who was on the hospital's local authorisation committee that approved the Thakur-Jaiswal case, is likely to appear before the inquiry panel on Tuesday. A police officer said the arrested doctors, including the hospital's CEO, "are not completely innocent".